Games like Witchblood
Games like Witchblood include Mouthwashing, No, I'm not a Human, SOMA, Outlast 2, and MiSide. We matched them by the tags players give Witchblood on Steam (Psychological Horror, Horror, Indie, Thriller, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

No, I'm not a Human
Shared: Psychological Horror · Horror · Indie

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Outlast 2
Shared: Psychological Horror · Horror · First-Person

MiSide
Shared: Psychological Horror · Horror · Story Rich

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Layers of Fear (2016)
Shared: Psychological Horror · Horror · Atmospheric

Still Wakes the Deep
Shared: Psychological Horror · Horror · First-Person

Poppy Playtime
Shared: Horror · Psychological Horror · Singleplayer

Sally Face - Episode One
Shared: Psychological Horror · Indie · Horror

Five Nights at Freddy's
Shared: Horror · Psychological Horror · Indie

Resident Evil 7 Biohazard
Shared: Horror · First-Person · Psychological Horror

Tiny Bunny
Shared: Horror · Psychological Horror · Atmospheric

Little Nightmares II
Shared: Horror · Psychological Horror · Atmospheric

Amnesia: The Dark Descent
Shared: Horror · Psychological Horror · Atmospheric

Blair Witch
Shared: Horror · Psychological Horror · Indie

Little Nightmares
Shared: Horror · Atmospheric · Indie

What Remains of Edith Finch
Shared: Atmospheric · Story Rich · First-Person

Visage
Shared: Psychological Horror · Horror · Dark

Resident Evil Village
Shared: Horror · First-Person · Singleplayer

Detention
Shared: Horror · Psychological Horror · Indie

Five Nights at Freddy's 2
Shared: Horror · Psychological Horror · Indie

Fran Bow
Shared: Psychological Horror · Horror · Story Rich

Firewatch
Shared: Atmospheric · Story Rich · First-Person